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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146046e6764087415c8edd35f4ff74cf4dc52c5a6f0fbea22aa08930b4f1b6ff' 
  AND token = 'izGXQYZKykk7eA/4b9yl3XDzqeMnSSzrSnccq+55SkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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