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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812c17743fd5dc42a56ab14b4b142b422d993181fe2ed86c5da3fd186b5d9ade' 
  AND token = 'kBwG0UwqhTn7lO0RXi2QLhiwSN/D7S1k7aG5gkiasp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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