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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161ec4d6263561d88c76d8e4c5849f50e89dbe434a683adc6d6b482d5e28b8d2' 
  AND token = 'ASi8YI/PlaqSlISiGdXVd9CNxOFXBQHlueqvyEocX50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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