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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceecd7b9e12488544a571b35c3cd5f9abdd523f1777cd86037368a951c2dc911' 
  AND token = '0wrAsxHQDx8PahVmQMTP7osfX5yQmc315Oi0QqXTy8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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