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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf56c1c8d9d430f199e593e85cb92a77d8be2debb8b8ae8e5169f91ce234de6' 
  AND token = 'B63CPrT3LqWvMb/cy29mLAWOtTbV1EHYLuZKAYdQ72s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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