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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bb2a1c4e9fcaada5809e963205329d911ce29b5ac1eaf2ae9619a443bcc708' 
  AND token = 'StwTOfxUnXzoG5me/lpcBt5v6sx6YioRYOdEKieUiac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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