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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c4d533f62e3663eb190dff33c0c15b8ccdfe803b58175fb6e51213d21c50ec' 
  AND token = 'qA1TxqLkB4+2KYG8jKJE8aBxLbY9TtwDwFfiBVU0RiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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