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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd3757f596d552ace999c7ec9b0232aa8c1c97c729d06cf242650466d53c498' 
  AND token = 'OUDH+rwDrqRJmS6lfzb1bZfySQ5uZzEccoYAs82+0nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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