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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1da31f6cdd3eb0cadd5e8e48cc5d67b4751c24d95a430609426082b8219d7c' 
  AND token = 'KuEzSlH+HD5k3uWk1xx0GYCyrnWeOgYyBHw+x0S99TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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