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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ab8224429a40ba0ba6bc43b1d27a3ee0fbd780c744c5aa5424497141ea66e0' 
  AND token = 'wgEcN+YOoyhZxC/iE5pnrLHWfQI/O519m598+1gCm1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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