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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d928cd4ac3cf63b27bc8d8796315c611e21efb4f7620aee27ef9f42eca744cb' 
  AND token = '1ocYc7ZQNlFORtFntXI9Pbxz2KeUpLzVUxRuwPBFjS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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