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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b4141a8d9d8019e86d264a49faf33aa3e99f0355c991f99b72010f0b2da82f' 
  AND token = 'JeufuWTLv5MDC0T7wYv+YybSefWgtFkN+XGJKSPBWMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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