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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564fb1df7ff5bc24c2516457e80f17bfe979489f0bc7728e27c8345b63321163' 
  AND token = 'e998C7QmkwwbiinZuyJFGcwVMdK6M6JIS6Q1vQ0BvhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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