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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636f49d4b8677048991daeade8d1ee302d5dc28ff8fcba36dacfd9ea43939960' 
  AND token = 'aSveNruQ4UnHL9tJNZO3lV2vX9NUf/6FbGmZkZ2rkNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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