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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8242c23363e7a29e6606f4508629f65ba522340e14eaed9c8e349fdbb5e2172' 
  AND token = 'yA6bA8IXCp/5YBqua1iwnOIHDlqoc4c0Km0LgfnjhdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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