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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401ce495d1f3e00cf95c299ff3dfd476c7c9d504dec9c7bce4c6e5f8d4fdd2b4' 
  AND token = 'Tz/RzZdx42+Ot1LplJDbHLP34gmjObMruZenFweNnwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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