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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb421fe2f74bdc47286b27522c617c283a5d0466369ff84a92d33926a140fc08' 
  AND token = 'Drb6H+ukRxejmT0NeE9kSTcwMSWVgrpu9JmuvzeNUbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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