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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b34d7faadc10c96adbf077442f6adcdf1dd52dded7bb7ddc70e9fe781d4af3a' 
  AND token = 'e79VKMDZZgvI2GhyJwfLLpTxM1gIzodnfp1bK9FOlSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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