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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e08e26ac8219f4afe6e59e3f75d058666c2e87adc0af07acead9df7f068169' 
  AND token = '4j3nq1ndBJZGF+GWglHaEPXLyS6mWRyyvVh8bYkr4S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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