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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70425f0f41190845a60af9976451e13fbfe59311c4012db78266f85618891436' 
  AND token = 'mKVgKb067bRj/4tOH0yO/4vJ+HX68Ac1a2dNym1+laY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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