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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf950cea6fe0917eff0aec5eb8e61d267b5df631ee57159cbd962311bca2ca2' 
  AND token = 'sgS3ZCRXyL8T+b0FujFqBFZKQm6o7a9JyNAbtPHx3Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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