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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4816bcfa70475849562338d35a8ffce0ae02e33cd78840d5bfe8be1dd76711' 
  AND token = '4jTt+ePxXEBxbjGP2F1RZeTU+6lNeLPA/d+1Js8B32c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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