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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0a3e7c886acef532c63e3f5df8a9b12b1bf9b61dbf8cabb1fa37d939b69ece' 
  AND token = '8yENov5WKiY9LVX4go8W0Z35np37It9XmVhwDwUASdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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