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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919fa54f7198d061d0ef44cdd7ae0b4f3945fe00b67b0e156e36c3fe6a8506fc' 
  AND token = 'L23GTTJOqRih7FBOSECcaK7rpst+SgPuZf5o2Q65Lrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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