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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790464fbac146251c0b945ba1b431e481f635d67aa82e333841b1b3509e99fda' 
  AND token = 'ateSjxZvL6zmKgazxeV61WYveiODZCjriluWDdWzI64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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