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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcba5b7a618757fd95ca200012a4955b6fc81a4dbdff8b7732ce3a5adcbdae70' 
  AND token = '6R3cVd3ETbwBA5Vo+tW0b0/Vxm1h74tmuRUyVGZ15js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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