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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d54a8b24013031ac0fe821f11217e5aed7a3a291105ead4f4e47d1488279e8' 
  AND token = 'u30yY79bFAWyvNa3t1jjGgkWIhqxaJ7ERPzt7y5uB3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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