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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be60d06aace7da14f3689606086e3919060254be321efd279a6153993c5f4d0b' 
  AND token = '/HhhcDRXD3TLupKcW/z73Rja6hxHT/t0LBAS8AWOpkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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