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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c711375aa9c47be0d008577e85f1346b17fbbf63225810b10596f86ea1aad19' 
  AND token = '3C0unj3tyDr04sfitjK+z1AVB6NyDmtOGcXJEdqVWsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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