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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca72783b4d78b268ac5eaf0ca966af7a9136b33533c339a9debb8433bea6efb5' 
  AND token = 'SE92w81DNHr+lGphjtkBe9+wZH+dcTGGuOvbO4YQSlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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