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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d69c649e0db1e25ce5cf9379ae3ac7d3fa06ac0cbd6a5c6c762f8e8ed72829d' 
  AND token = '6wTqaXFM/vihiwR08Ioht6u+fAa52f9URXlNgWaTBF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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