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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852214aa991891e22c35e5b64fbdb4ff71bdc79446be011530953e0103e19d72' 
  AND token = 'MzchUGyDJR6dwAnpEt23qamljwo2hN/lAo9Yq0Or5PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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