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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61426bde7647f44a23cfd69d1cfd50f896a1f9e9092ded160f1ba329231f00ba' 
  AND token = 'CIJwP/PtsrgZizbMnfNN59DBO3G3bHSS9WPPw/CHLDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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