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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57938f5fe59b5a0dd50cafaf26f2d487ab46b5218dda7eb53d797ab0d5a0cbf' 
  AND token = 'bWX4n+3KUPNo/vQvYbdU0eMze8e9h0+KU/5SOB8aN4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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