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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4ac923beac4328c35cf201a45beeffe5eeb74a70908ff624bedefe4da886a7' 
  AND token = '3TSwoL2OaIzBd3ZFiS6PcMl8d2GGd0V5pt5UYFcKdkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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