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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4072ba8ab43aee40b315695293fba434bd8bf3ddefead9d7bd0958212eb996e' 
  AND token = '8qs179M/wjG7Kp7SXIR1SCSBP9J7UKz45mmIs8ODdb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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