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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f17ef6a1c59fe78680864bcb1f0edbd6df9486ef07ed63b15030da9a96167c0' 
  AND token = 'hAqVKtER7dy6wS7t8ytGrNzypPYR738mDIMOLicp0lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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