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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7087e094c29f0c662c6a53a5c69dcc88ec2290929067e82829d18ccd5165eb' 
  AND token = 'ZH+gZzXzdrXZ6wwFSRq4Ioj+vA4B6p4euN00G704Tm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}