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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8555fb0ef92c9fdd647b904d56a345ed9b15082a70dadf2fa3bbe844d18edbd' 
  AND token = 'YYWh9uhtUUWbLquTaH7rg5D/yppB1t20TpsXlMyYroo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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