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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ac6f1c3cd6cd2830231aa083427bbef078a8f00577482d6d58db3c85733390' 
  AND token = 'MjTP3wvvJ5u78BmIaBqnwPIv/+t/j/8yNv3QY3QUGnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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