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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30f7e451b7dae82ef485e95bbd475f63d7cbdd4f624a5492a5b73718859cfee' 
  AND token = 'G6wFcqjeu782yZOk5QODiatovyCXsNQgKYXn9HOI51w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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