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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7ade9d6a5828d1d432236c6111de1a90594714c4c7b2dc434b47f135366e49' 
  AND token = 'PUwiQ3uPBk1QRebEYkDl6IWiGhGYcvI30OGkbYO+lj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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