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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e9a5e1ef0555a240417840421e19c0f7cdb23b51a6ec54bd771a91cad52b63' 
  AND token = 'MIXIucwbhpVkoGkMRW6oGbkkBksujgUfBhd3mR4WkMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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