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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00da334f51e939a14642884ca5b905f5ab9c39e76157dc35d6761c802879733' 
  AND token = 'gt6Cxgwx7HIoDRXyMOZVxoWCR2c7Lnb+s+CY3zHBERA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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