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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acbd740217d0c524f7dbf9c58d3c8efeee82c564e310c9080721fc0d66619ff' 
  AND token = '5WzdFUXv1ux29SNLwNVTurLfm2f1Z872gkMp5P3sPOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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