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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93ded79f82f6e43ac6a3673e5b6faf7390807e2e02788fb97a0b6b0f3027d40' 
  AND token = 'ejFUTmKlbuMI3Ipjh4IWbg48AqWWRtt50BgkvKMy/nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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