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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3cc0f94249834d73bc6f31bc562f5f293b1cc9802d961acb677239c6f89831' 
  AND token = 'i1ATxv46SSadNUnGIuQiYKXjviwQL6qFNjNnQMngAUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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