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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9619a1101e25f98815871a776b9f002aba7f4ddd586d1500aa1b4b59943587' 
  AND token = 'YDb73R4azKsZ2QDcnE8jLXYRjnoQNc5WHNHjI4FYBIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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