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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09047a91c84b7f1cfb254b802239cc15ecebf32c729ca7692b95bd5eb1010a88' 
  AND token = 'Pckj7j6sbhT70guvLc3ePlgppotgGpUnlvLMqYp/gTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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