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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd973b0d95eb5d2e668636d87a1f4deb6f923fe2e3bbc6b8ca4b47930915a4f69' 
  AND token = 'nQQOmTDkM9mNmaLyq37C7/7Wjf7k7pT6ys+pi4N72VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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