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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f53dce50ca90b17598dcbff5535dacf4b8d63d983402fcf2f4500281bf4ba7' 
  AND token = '1OtN81p0EC5LzX2EGjOyOC6TUQINmi9jAyVUkVTNqGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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