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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3235c510eb282d50b79565a66ed4c36ff23aa6e152d081cfb79acfa5bf077389' 
  AND token = 'B0d+1Xs6GpPqJXBkD+LGjO4b+WDtIn4o3MRW2qDgb2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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