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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7f5e8698ab7b40920dffa2cffc73da0fcdc2fe2bab8c2213ce04a7b149b10e' 
  AND token = '8fdX6WxQjk4QdhdvnpNxlFN/LFSaiKahss20IgTa2yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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