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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c834a4a73996b00230969d2e591ead655251e5b9295f13834c319ab316792626' 
  AND token = 'qdT46+l3ZV8DztBZsImydputd0TFC6GQk2MJdF5BOm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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