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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963511ee7a30c61d552db901f30a35f643a18544897892f778ac032d8c7dc1e4' 
  AND token = 'vtNmOEvhKI5j1gFS4S7ptQovfP9zWtNUQNNF8IXn7iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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