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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889afc879ffccd034e3d89b49c3cb380737d1ffef758edf8d19f373dac371cbe' 
  AND token = 'ZRCJH1jHQh5qOmjLD0gofm1GuQQHUU2EH817za3p598=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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