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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbde811f7f61615b262a6d66ecc3c17d9742672569a7e99c906230cbd9e41307' 
  AND token = 'S3XsGPSc18eoEef0oQl0xRWtQ4t4Foe4GU7Lj6rf5sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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